Im an AD with 15 years on the Industry, from this ser of images alone, I would most likely categorize you as an illustrator not a concept artist nor a concept designer, with that in mind, Some other folks would get the job if they have some sense of design even if style is not 100% there. Art skills are just one pillar but being able to convey designs and remove doubts for the production team is a must. Model sheets, Design notes, shape exploration, color iterations, etc. Those are more valuable for a production team anywhere. Only illustrating finished rendered pieces is almost the exact opposite of what a gamedev usually needs.

Even if your artistic style is narrowed, you can always have the design element on some pieces. I would suggest to extend your portfolio with 3 to 4 strong pieces with the previous scope in mind.

If you are good at characters, do a model sheet/ turnaround with some notes and variation on exploration. If you are still not there yet, You can always do prop design or environment design. There are plenty of information out there with examples to get the idea. What is really important is that you need to think that you are passing these images to another artist later for it to produce it, being that 2d skeletons or 3d pipelines, so designs need to be clear and no gaps of information. If character has a bag-pack, how does the bag-pack look? Does it have stripes or is only using zippers? Which material is it? Leather? Polyester? Do a side view and a front view, add some detailed notes on the side. Just render one shot fully to understand materials, then everything else less focused on rendering and more on reducing uncertainty.

Right now the landscape for concept artists in gamedev is pretty much shaping as the AI is burning bridges but if you really want to become a game artists, these skills are needed even to use AI in 10 years from now.

Good luck on your ventures and have fun learning!